Air mattress



FIG. 1 is a top plan view of an air mattress showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a second side elevational view thereof;

FIG. 5 is a third side elevational view thereof;

FIG. 6 is a fourth side elevational view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawings depict portions of the air mattressthat form no part of the claimed design.

The oblique lines shown on the side views depict the transparency of thesides of the air mattress.

CLAIM The ornamental design for an air mattress, as shown and described.